package com.zbkj.service.service.ai.utils;

import org.apache.commons.codec.binary.Base64;
import org.springframework.web.multipart.MultipartFile;
import sun.misc.BASE64Decoder;

import java.io.*;
import java.net.URL;


/**
 * base64转MultipartFile
 * @author
 */
public class Base64ToMultipartFile implements MultipartFile {
    private final byte[] imgContent;
    private final String header;

    public Base64ToMultipartFile(byte[] imgContent, String header) {
        this.imgContent = imgContent;
        this.header = header;
    }

    @Override
    public String getName() {
        // TODO - implementation depends on your requirements
        return System.currentTimeMillis() + Math.random() + "." + header.split("/")[1];
    }

    @Override
    public String getOriginalFilename() {
        // TODO - implementation depends on your requirements
        return System.currentTimeMillis() + (int) Math.random() * 10000 + "." + header.split("/")[1];
    }

    @Override
    public String getContentType() {
        // TODO - implementation depends on your requirements
        return header.split(":")[1];
    }

    @Override
    public boolean isEmpty() {
        return imgContent == null || imgContent.length == 0;
    }

    @Override
    public long getSize() {
        return imgContent.length;
    }

    @Override
    public byte[] getBytes() throws IOException {
        return imgContent;
    }

    @Override
    public InputStream getInputStream() throws IOException {
        return new ByteArrayInputStream(imgContent);
    }

    @Override
    public void transferTo(File dest) throws IOException, IllegalStateException {
        new FileOutputStream(dest).write(imgContent);
    }

    /**
     * base64转MultipartFile文件
     *
     * @param base64
     * @return
     */
    public static MultipartFile base64ToMultipart(String base64) {
        try {
            String[] baseStr = base64.split(",");

            BASE64Decoder decoder = new BASE64Decoder();
            byte[] b = new byte[0];
            b = decoder.decodeBuffer(baseStr[1]);

            for (int i = 0; i < b.length; ++i) {
                if (b[i] < 0) {
                    b[i] += 256;
                }
            }

            return new Base64ToMultipartFile(b, baseStr[0]);
        } catch (IOException e) {
            return null;
        }
    }

    /**将网络url文件转换成Base64字符串 */
    public static String convertImageToBase64(String imageUrl) {
        try {
            URL url = new URL(imageUrl);
            InputStream inputStream = url.openStream();
            ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
            byte[] buffer = new byte[1024];
            int bytesRead;
            while ((bytesRead = inputStream.read(buffer)) != -1) {
                byteArrayOutputStream.write(buffer, 0, bytesRead);
            }
            byte[] imageBytes = byteArrayOutputStream.toByteArray();
            return Base64.encodeBase64String(imageBytes);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

}
